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United States Patent |
5,605,357
|
Bird
|
February 25, 1997
|
Pipe collar
Abstract
A pipe collar comprising first and second arcuate shell members, clamping
means for drawing the shell members together around a pipe, and improved
sealing means disposed in each of the shell members, for facilitating
sealing engagement between the pipe collar and the pipe, and between the
respective shell member sealing means.
Inventors:
|
Bird; Edwin A. (Ashdown, AR)
|
Assignee:
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M&FC Holding Co. (Wilmington, DE)
|
Appl. No.:
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461115 |
Filed:
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June 5, 1995 |
Current U.S. Class: |
285/15; 285/373; 285/379 |
Intern'l Class: |
F16L 055/172 |
Field of Search: |
282/373,379,419,15
|
References Cited
U.S. Patent Documents
2689140 | Sep., 1954 | Bonalli | 285/69.
|
2690193 | Sep., 1954 | Smith | 285/373.
|
3467141 | Sep., 1969 | Smith | 285/373.
|
4109944 | Aug., 1978 | Curtin | 285/373.
|
4768813 | Sep., 1988 | Timmons | 285/373.
|
5018548 | May., 1991 | McLennan | 285/373.
|
5037141 | Aug., 1991 | Jardine | 285/177.
|
5121946 | Jun., 1992 | Jardine | 285/15.
|
5295716 | Mar., 1994 | Bridges | 285/373.
|
Foreign Patent Documents |
547986 | Nov., 1959 | BE | 285/373.
|
2189000 | Oct., 1987 | GB | .
|
Primary Examiner: Nicholson; Eric K.
Attorney, Agent or Firm: Wood, Herron & Evans, P.L.L.
Claims
Having thus described my invention, what I claim as new and desire to
secure by Letters Patent of the United States is:
1. In a pipe collar comprising first and second arcuate shell members,
clamping means for drawing said shell members together around a pipe,
first and second sealing assemblies of elastomeric material, respectively
disposed interiorly of said shell members, wedge members disposed between
said shell members proximate said clamping means and adapted to slide
along interior surfaces of said shell members as said shell members are
drawn together, each of said sealing assemblies comprising a pair of
circumferential sealing strips spaced apart and interconnected by axially
extending sliding sealing strips and axially extending end sealing strips,
said end sealing strips being disposed within axial end grooves in said
wedge members, such that a first of said wedge members having a first of
said end sealing strips therein is opposed to and movable towards a second
of said wedge members having a second of said end sealing strips therein,
whereby engagement of said first and second end sealing strips effects a
seal therebetween, the improvement in which each of said end sealing
strips in side elevation is of a zig-zag configuration and disposed in one
of said end grooves, said end sealing strips being complementary to each
other such that a peak of said first end sealing strip is adapted to be
received by a valley of said second end sealing strip and a peak of said
second end sealing strip is adapted to be received by a valley of said
first end sealing strip, whereby upon engagement of said first and second
end sealing strips, said end sealing strips are urged into interfitting
relationship, thereby to properly position said sealing assemblies
lengthwise thereof.
2. The pipe collar in accordance with claim 1 in which said end sealing
strips are each provided with beveled edges and an engagement surface,
which edges extend beyond an end surface of said wedge member in which
said end sealing strip is disposed, and extend to said engagement surface
removed from said end surface.
3. The pipe collar in accordance with claim 2 in which said beveled edges
of opposing ones of said end sealing strips are shaped complementarily,
such that upon engagement of opposing ones of said beveled edges, said
opposing end sealing strips are adapted to slide one upon the other to
bring the respective engagement surfaces of said opposing end sealing
strips into engagement with each other.
4. The pipe collar in accordance with claim 1 wherein surfaces of each of
said wedge members comprise said elastomeric material.
5. The pipe collar in accordance with claim 4 wherein each of said wedge
members is encapsulated in said elastomeric material.
6. The pipe collar in accordance with claim 3 wherein each of said wedge
members is encapsulated in said elastomeric material.
7. The pipe collar in accordance with claim 2 in which said sliding sealing
strips are each provided with beveled edges and an engagement surface,
which sliding sealing strip edges extend beyond an arcuate shell-member
engagement surface of said wedge member in which said sliding sealing
strip is disposed, and extend to said sliding sealing strip engagement
surface removed from said shell member engagement surface.
8. The pipe collar in accordance with claim 1 wherein said sealing means
are vulcanized in said wedge members.
9. In a pipe collar comprising first and second arcuate shell members,
clamping means for drawing said shell members together around a pipe,
first and second sealing assemblies of elastomeric material respectively
disposed interiorly of said shell members, wedge members disposed between
said shell members proximate said clamping means and adapted to slide
along interior surfaces of said shell members as said shell members are
drawn together, each of said sealing assemblies comprising a pair of
circumferential sealing strips spaced apart and interconnected by axially
extending sliding sealing strips and axially extending end sealing strips,
said end sealing strips being disposed within axial end grooves in said
wedge members, such that a first of said wedge members having a first of
said end sealing strips therein is opposed to and engagable with a second
of said wedge members having a second of said end sealing strips therein,
whereby engagement of said first and second end sealing strips effects a
seal therebetween, the improvement in which each of said end sealing
strips is provided with beveled edges and an engagement surface, which
edges extend beyond an end surface of said wedge member in which said end
sealing strip is disposed, and extend to said end sealing strip engagement
surface removed from said wedge member end surface.
10. The pipe collar in accordance with claim 9 in which said beveled edges
of opposing ones of said end sealing strips are shaped complementarily to
each other, such that upon engagement of opposing ones of said beveled
edges, said opposing end sealing strips are adapted to slide one upon the
other to bring the respective engagement surfaces of said opposing end
sealing strips into engagement with each other.
11. The pipe collar in accordance with claim 9 in which said sliding
sealing strips are each provided with beveled edges and an engagement
surface, which sliding sealing strip edges extend beyond an arcuate shell
member engagement surface of said wedge member in which said sliding
sealing strip is disposed, and extends to said sliding sealing strip
engagement surface which is removed from said shell member engagement
surface of said wedge member.
12. The pipe collar in accordance with claim 10 in which said sliding
sealing strips are each provided with beveled edges and an engagement
surface, which sliding sealing strip edges extend beyond an arcuate shell
member engagement surface of said wedge member in which said sliding
sealing strip is disposed and extend to said sliding sealing strip
engagement surface which is removed from said shell member engagement
surface of said wedge member.
13. The pipe collar in accordance with claim 12 wherein surfaces of each of
said wedge members comprise said elastomeric material.
14. The pipe collar in accordance with claim 13 wherein each of said wedge
members is encapsulated in said elastomeric material.
15. The pipe collar in accordance with claim 9 wherein said sealing means
are vulcanized in said wedge members.
16. In a pipe collar comprising first and second arcuate shell members,
clamping means for drawing said shell members together around a pipe,
first and second sealing assemblies of elastomeric material respectively
disposed interiorly of said shell members, wedge members disposed between
said shell members proximate said clamping means and adapted to slide
along interior surfaces of said shell members as said shell members are
drawn together, each of said sealing assemblies comprising a pair of
circumferential sealing strips spaced apart and interconnected by axially
extending sliding sealing strips and axially extending end sealing strips,
said end sealing strips being disposed within axial end grooves in said
wedge members, such that a first of said wedge members having a first of
said end sealing strips therein is opposed to and engagable with a second
of said wedge members having a second of said end sealing strips therein,
whereby engagement of said first and second end sealing strips effects a
seal therebetween, said sliding sealing strips being disposed each in an
axial groove in one of said wedge members, the improvement in which said
sliding sealing strips are each provided with beveled edges and an
engagement surface, which edges extend beyond a shell member engagement
surface of said wedge member in which said sliding sealing strip is
disposed and extend to said sliding sealing strip engagement surface which
is removed from said shell member engagement surface of said wedge member.
17. The pipe collar in accordance with claim 16 in which the surfaces of
each of said wedge members comprise said elastomeric material.
18. The pipe collar in accordance with claim 16 in which each of said wedge
members is encapsulated in said elastomeric material.
19. The pipe collar in accordance with claim 16 wherein said sealing means
are vulcanized in said wedge members.
20. In a pipe collar comprising first and second arcuate shell members,
clamping means for drawing said shell members together around a pipe,
first and second sealing assemblies of elastomeric material respectively
disposed interiorly of said shell members, wedge members disposed between
said shell members proximate said clamping means and adapted to slide
along interior surfaces of said shell members as said shell members are
drawn together, each of said sealing assemblies comprising a pair of
circumferential sealing strips spaced apart and interconnected by axially
extending sliding sealing strips and axially extending end sealing strips,
said end sealing strips being disposed within axial end grooves in said
wedge members, such that a first of said wedge members having a first of
said end sealing strips therein is opposed to and engagable with a second
of said wedge members having a second of said end sealing strips therein,
whereby engagement of said first and second end sealing strips effects a
seal therebetween, said sliding sealing strips being disposed each in an
axial groove in one of said wedge members, the improvement in which said
sealing means are each bonded to their respective wedge members by
vulcanization of said sealing means in said wedge members.
Description
FIELD OF THE INVENTION
The invention relates to collars for pipes, and is directed particularly to
repair collars and/or jointing collars having improved sealing means
therein.
BACKGROUND OF THE INVENTION
Pipe collars of the general type herein concerned are known in the art. It
is known, for example, to provide a pipe collar having first and second
arcuate shell members with clamping means for drawing the shell members
together around a pipe. It is further known to provide first and second
elastomeric arcuate sealing means respectively disposed interiorly of each
shell member, and wedge members disposed between the shell members and
adapted to slide on interior surfaces of the shell members as the shell
members are drawn together by the clamping means. Each of the arcuate
sealing means are known to comprise a pair of circumferential sealing
strips spaced apart, and interconnected, by axial sealing strips which
slidingly engage the interior surfaces of the shell members, and by axial
end sealing strips, two of which contact each other to form a seal between
two opposed ends of the sealing means. It is known that both sets of axial
sealing strips are disposed in grooves in the wedge members. A pipe collar
of this construction is shown and described in British Patent No.
2,189,000, published Nov. 22, 1989, in the name of Robert W. Jardine.
In the Jardine pipe collar, each of the end sealing strips is disposed in
an axial, or longitudinal, groove in the end of a wedge member. Each end
sealing strip is rectangular in width-wise cross section and upstands from
the wedge member end surface in which its respective groove is located. In
an effort to encourage pairs of opposed end sealing strips to properly
engage one another, each wedge member is provided at its end with inclined
width-wise extending ramp surfaces adapted to engage with oppositely
inclined ramp surfaces of the opposite wedge. While the ramp surface
arrangement may be beneficial with respect to correction of width-wise
misalignment of the end sealing strips, it is not instrumental in leading
to proper length-wise alignment of the end sealing strips, and thereby the
two sealing means. Further, because of the rectangular shape of the end
sealing strips, the goal of the ramp surfaces is sometimes thwarted by a
side-by-side mating of two end sealing strips.
In the Jardine pipe collar, each of the sliding sealing strips is
rectangular in cross section and is wholly contained within its groove in
its wedge member. Because the sliding sealing strip is substantially flush
with the wedge member surface, its sealing effectiveness is minimal.
Additionally, the circumferential sealing strips of the Jardine collar are
substantially flat on the side of the strip that contacts the pipe. Thus,
substantial force must be applied to conform the thick, rigid ends of the
strip to the pipe. This creates undesirable stresses within the collar,
and makes assembly difficult.
Moreover, when the Jardine pipe collar is used with pipe large enough in
diameter to require stretching of the circumferential sealing strips, it
often happens that the ends of the sliding sealing strips, at their
junctures with the circumferential sealing strips, are pulled from their
respective grooves in the wedge members, opening leakage avenues between
the pipe and the collar, greatly lessening the effectiveness of the
sealing means.
Accordingly, it is deemed beneficial to provide a pipe collar of general
construction similar to Jardine's, but having improved sealing
capabilities, and in particular, sealing capabilities overcoming the
inadequacies of the Jardine collar.
SUMMARY OF THE INVENTION
It is, therefore, an object of the invention to provide a pipe collar of
the type above described, in which the end sealing strips are configured
to provide proper lengthwise alignment, as well as improved widthwise
alignment.
A further object of the invention is to provide a pipe collar of the type
above described, in which the sliding sealing strips are configured for
improved sealing capabilities while retaining acceptable sliding
capabilities.
A further object of the invention is to provide a pipe collar to the type
above described, in which the circumferential sealing strips will conform
to a pipe under only minimal force.
A further object of the invention is to provide a pipe collar of the type
above described, in which the axially extending end sealing strips and
sliding sealing strips are permanently bonded to their respective wedge
members in their respective grooves and not amenable to pulling therefrom.
A still further object of the invention is to provide a pipe collar of the
type above described having wedge members of construction affording
improved longevity in service.
With the above and other objects in view, as will hereinafter appear, a
feature of the present invention is the provision, in a pipe collar as
above described, of end sealing strips, each of which in side elevation
has an engagement surface of a zig-zag configuration and is disposed in a
wedge member end groove. The end sealing strips engagement surfaces are
complementary to each other, such that a peak of a first end sealing strip
is adapted to be received by a valley of a second, and opposed, end
sealing strip; whereby, upon engagement of the first and second end
sealing strips, the strips are urged into interfitting relationship,
thereby to properly position the arcuate sealing means lengthwise thereof.
In accordance with a further feature of the invention, there are provided,
in a pipe collar of the Jardine type, end sealing strips each provided
with beveled edges and an engagement surface, which edges and surface
extend beyond an end surface of the wedge in which the end sealing strip
is disposed, such that opposed end sealing strips, upon engagement with
each other, are adapted to slide one upon the other to bring the
respective engagement surfaces of the opposed end sealing strips into
engagement with each other.
In accordance with a further feature of the invention, there are provided,
in a pipe collar of the Jardine type, sliding sealing strips disposed each
in an axial groove in a wedge member, the sliding sealing strips each
being provided with beveled edges and an engagement surface, which edges
and surface extend beyond an arcuate member engagement surface of the
wedge member in which the sliding sealing strip is disposed.
In accordance with a further feature of the invention, there are provided,
in a pipe collar of the Jardine type, circumferential sealing strips
having pipe contact surfaces which are radiused at the thick, rigid ends
of the strips to allow the strip to conform to the pipe under minimal
force.
In accordance with a still further feature of the invention, the end
sealing strips and sliding sealing strips are vulcanized to their
respective wedge members so as to render virtually impossible the
dislodgment of the sealing strips from their respective grooves.
In accordance with a still further feature of the invention, there is
provided, in a pipe collar of the Jardine type, wedge members in which the
outer surface thereof is of the same material as the sealing strips.
The above and other features of the invention, including various novel
details of construction and combinations of parts, will now be more
particularly described with reference to the accompanying drawings and
pointed out in the claims. It will be understood that the particular
device embodying the invention is shown by way of illustration only and
not as a limitation of the invention. The principles and features of this
invention may be employed in various and numerous embodiments without
departing from the scope of the invention.
BRIEF DESCRIPTION OF THE DRAWING
Reference is made to the accompanying figures in which is shown an
illustrative embodiment of the invention, from which its novel features
and advantages will be apparent.
In the Figures:
FIG. 1 is an exploded perspective view of one form of pipe collar
illustrative of an embodiment of the invention;
FIG. 2 is a sectional view of the pipe collar of FIG. 1;
FIG. 3 is center sectional view of a circumferential sealing strip
according to the invention;
FIG. 4 is a side elevational view of an end sealing strip according to the
invention;
FIG. 5 is a side sectional view of a wedge member according to the
invention showing its interrelationship with a sliding sealing strip and
end sealing strip according to the invention.
FIG. 6 is a side sectional view of a sealing assembly according to the
invention wherein the material of the sealing strip has been formed over
the wedge member.
FIG. 7 is an end view of a circumferential sealing strip according to the
invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIGS. 1 and 2 of the drawings, it will be seen that an
illustrative embodiment of the invention includes first and second arcuate
shell members 2, 4 of rigid material adapted to remain intact for decades
in an underground environment. Each shell member has at each end thereof
outwardly extending lugs 6 adapted to receive bolts 8. The lugs 6 and the
bolts 8 serve as clamping means for drawing the shell members 2, 4
together around a pipe (not shown), or a pair of pipe ends (not shown).
Each of the shell members 2, 4 receives an elastomeric sealing assembly 10.
Each of the sealing assemblies 10 includes a pair of circumferential
sealing strips 12 spaced apart and interconnected by axially extending
sliding sealing strips 14 and axially extending end sealing strips 16. The
end sealing strips 16 join ends of the circumferential sealing strip 12.
The sliding sealing strips 14 extend between the circumferential sealing
strips 12 at positions on the circumferential sealing strips spaced from
the ends thereof and thereby spaced from the end sealing strips 16.
Proximate each pair of the lugs 6, and disposed between the arcuate shell
members, 2, 4, and adjacent part of the sealing assembly 10 is a wedge
member 18. Each wedge member 18 is retained in position on its elastomeric
sealing assembly by means of the axially extending sliding sealing strips
14 and the end sealing strips 16 being disposed, respectively, in grooves
20 and end grooves 22 in the wedge members.
The sealing assembly circumferential sealing strips 12 are provided with
internally protruding ribs 24 which serve to prevent axial movement of the
sealing assembly 10 on the pipe and serve to effect sealing with the
periphery of the pipe. Referring also to FIG. 3, the sealing strips 12 are
provided with beveled edges 25 which facilitate sliding of the strips 12
and proper alignment of the members 2, 4 during assembly.
Each of the wedge members 18 has a shell member engagement surface 26 which
slidingly abuts an inner face 28 of one of the shell members 2, 4. As the
shell members 2, 4 are drawn together by the bolts 8, the wedge members 18
are caused to slide within the shell members to force the elastomeric
sealing assemblies 10, and particularly the circumferential sealing strips
12, inwardly against the pipe in the region of the lugs 6. There results a
substantially uniform compression of the sealing assembly 10 around the
pipe, effecting a fluid tight seal therewith.
Referring to FIGS. 1 and 4, it will be seen that engagement surfaces 29 of
the end sealing strips 16, in side elevation, are of a zig-zag
configuration, and disposed each in one of the end grooves 22. The end
sealing strips opposing each other are complementarily shaped relative to
each other, such that a peak 30 of one end sealing strip engagement
surface 29 is adapted to be received by a valley 32 of the opposed end
sealing strip engagement surface. Such configuration urges opposed end
sealing strips to slide into complementary engagement, thereby to insure
proper lengthwise orientation of the sealing means 10.
Referring to FIG. 5 it will be seen that each of the end sealing strips 16
is, in widthwise cross section, provided with beveled edges 34, 36 leading
to an engagement surface 29. The beveled edges extend beyond an end
surface 40 of each of the wedge members 18, placing the engagement surface
29 in a position removed from the end surface 40. The beveled edges 34, 36
of opposing end sealing strips 16 are shaped complementarily to each
other, such that, as the shell members 2, 4 are clamped together, if the
end sealing strips 16 are misaligned widthwise, they are adapted to slide,
one upon the other, to bring the opposed engagement surfaces 29 into
engagement with each other. Thus, the unique configuration of the end
sealing strips serves to align opposed end sealing strips, both lengthwise
and widthwise, during clamping together of the shell members 2, 4.
In addition, the axially extending sliding sealing strips 14 are disposed
in grooves 20 in the wedge members 18. Like the end sealing strips 16, the
sliding sealing strips 14 are each provided with beveled edges 44, 46 and
an engagement surface 48, which extend beyond the engagement surface 26 of
the wedge member in which the sliding sealing strip is located.
Referring to FIG. 6, it will be seen that the surfaces of each of the wedge
members 18 are covered by the elastomeric material from which is made the
sealing assembly 10. The encapsulation of the wedge members 18 in the
elastomeric material of the sealing assembly 10 provides the entire
sliding surfaces of the wedge members with a more pliable wear surface and
serves to preserve the wedge members, which may be of cast iron, or other
metal.
Turning now to FIG. 7, the circumferential sealing strip 12 includes a
substantially flat shell member contact surface 51, and a pipe contact
surface 52. The pipe contact surface 52 of the strip has a substantially
flat surface near the middle of the strip and is curved or radiused toward
the ends of the strip. This radius is dimensioned to allow the strip to
conform to the pipe under only minimal force during assembly, and,
therefore, varies according to the size of the pipe. A radius is also
formed on the ends 53, 54 of the pipe contact surface to allow the ends to
slide over opposing surfaces during assembly.
In operation, as the shell members 2, 4 are drawn together by the bolts 8,
the wedge members 18 are caused to slide so as to force the sealing
assembly 10 inwardly in the regions of the lugs 6, to close onto the pipe.
The thin middle section of the sealing strip flexes to conform to the
pipe, while the radii formed on the ends of the strip 12 allow the ends to
conform to the pipe. As the opposing shell members are drawn together, the
end sealing strips 16 operate, by interfitting, to bring the opposed
sealing assemblies 10 into lengthwise and widthwise alignment with each
other. Simultaneously, the configuration of the sliding sealing strips 14
permits easy sliding of the strips along their respective shell member
inner faces 28. The beveled edges 44, 46 of the sliding sealing strips 14
facilitate easy sliding along the shell member inner surface 28, and the
protrusion of the sliding sealing strips 14 insures close contact with the
inner surfaces 28 of the shell members 2, 4.
In instances in which the circumferential sealing strips 12 are stretched,
as when the collar is used on pipe having a half circumference exceeding
the length of the circumferential sealing strips 12, it is important that
the sliding sealing strips 14 and the circumferential sealing strips 12
not be pulled from their respective grooves 20. Accordingly, the sealing
assemblies 10 preferably are vulcanized in placed in the wedge member
grooves. Once vulcanized, the bonding of the sealing means elastomeric
material to the wedge member 18 exceeds the strength of the elastomeric
material, such that there is no pulling of the sealing strips from the
wedge member grooves.
It is to be understood that the present invention is by no means limited to
the particular constructions herein disclosed and/or shown in the
drawings, but also comprises any modifications or equivalents within the
scope of the claims.
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